replacement for wrong trials

[Marina O]

That's what I was afraid of... I'm kind of already terrified by the
fact that I'll have to program the TTL pulses to neuroscan (wich, as a
matter in fact, I already saw that was discussed here). I'm aware of
the PST web support, but I've been in contact with them to get the
technical manual of the SRBox, and it took almost a month to get it.
Is good to know that's ok to share the material I've got with you,
I'll post it in a separate subject, so it will be easier for others to
find it. After making some tutorials to improve my (at the moment
inexistent) programming skills, I'll tell you what's the solution for
this kind of issue!

Thanks for the tips!

Marina

On 10 jun, 17:42, David McFarlane <mcfar... at msu.edu> wrote:
> Oh, the StudyRecall example might also help out here.
>
> >Marina,
>
> >Stock reminder:  1) I do not work for PST.  2) PST's trained staff
> >takes any and all questions at
> >http://support.pstnet.com/e%2Dprime/support/login.asp, and they
> >strive to respond to all requests in 24-48 hours -- this is pretty
> >much their substitute for proper documentation, so make full use of
> >it.  3) If you do get an answer from PST Web Support, please extend
> >the courtesy of posting their reply back here for the sake of others.
>
> >That said, here is my take...
>
> >So you want to rerun only trials with incorrect responses until the
> >subject responds correctly?  I don't see any way to do that without
> >some inline code.  For examples, look at the CriterionForExit and
> >and RerunErrors examples downloadable from the PST web site
> >(warning:  in general PST programmers are pretty sloppy, so do not
> >take these as models of proper programming practice, take them only
> >as rough exercises to illustrate certain features and then abstract
> >from there).
>
> >-- David McFarlane, Professional Faultfinder
> >"When all is said and told, the 'naturalness' with which we use our
> >native tongues boils down to the ease with which we can use them for
> >making statements the nonsense of which is not obvious."  -- Edsger
> >W. Dijkstra, "On the foolishness of 'natural language programming'"
> >(http://www.cs.utexas.edu/users/EWD/transcriptions/EWD06xx/EWD667.html)
>
> >>Hi, I'm intersted in replacing only wrong trials in a block. The block
> >>is setted to chose trials randomly (without replacement). My goal is
> >>to have the same number of correct trials for each condition, since
> >>I'm also collecting EEG data and it would be better for comparisons of
> >>the electrophysiological data to have the same number of epochs. I'm
> >>collecting reaction time data from all of the 10 hand fingers, and
> >>it's already known (from previous experiments we've made) that the
> >>probability of wrong responses are different for each finger. Is there
> >>an easy way to do it? A hard one would be usefull as well, but my
> >>programming skills are (very) limmited.
>
> >>I deeply appreciate your help,
>
> >>Marina

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